Electric switching apparatus for high tension



May 15, 1956 H. A. HlDDE NlJLAND 2,745,992

ELECTRIC SWITCHING APPARATUS FOR HIGH TENSION 2 Sheets-Sheet 1 FiledAug. 23, 1954 M y 5, 1956 H. A. HlDDE NIJLAND 2,745,992

ELECTRIC SWITCHING APPARATUS FOR HIGH TENSION 2 Sheets-Sheet 2 FiledAug. 25, 1954 w/ I Z 1 r :1 i, 4 :1 5 iii/141 N .ill l |||\|1 I v wh. 4r 2 M 2 7 1| FVI r111 V v 5 3 6 2 1 2 4 2 7 0 1 m a 2 W I u m m :1 4 5I. I 3 J ll N l i u :3--. II. l m w A I? I I! la 0 6 8 & 2 2

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the annular core in a plurality of turns, so that the primary winding ofthe transformer is of the multiturn type.

' Q United States Patent ce 2745992 Patented May 15, 1956 For thepurpose of illustration, reference is had to the 2,745,992 drawing, inwhich:

1 i Fig. l is a somewhat diagrammatic elevation, partly in ELECTRIC SFOR HIGH section, of a switch or circuit breaker in accordance with 5the invention, the switching element thereof being partly Hendrik A..Hidde Nijland, Laren, Netherlands, assignor m d fr m th Casing, and

to N. V. COQ, Utrecht, Netherlands, a company of Fig. 2 is a verticalsection, drawn to a larger scale, of the Netherlands that part of theswitching element, which is essential as far as the inventionisconcerned. Apphcatwn August 1954 Sena! 451586 In the drawing, 1designates a metal casing which dur- Claims priority, applicationNetherlands August 24, 1953 ing operation of the apparatus is filledwith mineral oil. Projecting into said casing and insulatedly passedthrough 6 Claims (CL 317 157'6) the wall thereof are lead-in conductors,whose pin-shaped terminals are indicated by 2 and 3, respectively. SaidThe invention relates to electric switching or circuitconductors areconnected to a system of busbars (not breaking apparatus for hightension, of the known type shown) accommodated in a box 4, and to acable 5, comprising in combination: respectively.

A stationary metal casing provided with a detachable Detachably mountedin the casing is a composite switchcover and with leading-in conductorsinsulatedly passed ing element suspended from the cover plate 6 of thecasthrough its wall, said casing being filled, or adapted to ing 1. Thiselement is composed of two sections, the be filled, with an insulatingfluid such as mineral oil, and first comprising: a vertical, insulatingtube 7 accommodatat least one composite switching element secured tosaid ing a switching contact 8, an axially movable, pin-shaped cover andcomprising a stationary switching contact, a switching contact 9cooperating therewith, and a conmovable switching contact adapted tocooperate therenecting contact 10 connected to the switching contact 8with, two connecting contacts electrically connected with and adapted tocooperate with the terminal 2, the second the said switching contacts,respectively, and a current section comprising: two vertical, insulatingtubular memtransformer electrically inserted intermediate one of saidbers 11, 12, two transverse, insulating tubes 13, 14 interswitchingcontacts and one of said connecting contacts, connecting said tubularmembers, a second connecting said connecting contacts cooperating withterminals procontact 15 adapted to cooperate with the terminal 3, and avided on the leading-in conductors so as to permit the currenttransformer comprising a primary winding 16, switching element to bebodily removed from, and be an annular magnetic core 17 and a secondarywinding 18. positioned in, said casing Whilst the leading-in conductorsThe tubular members 11, 12 are secured to a plate 19 are alive. which,by means of bolts 20 and spacer sleeves 21, is

In known switching apparatus of this type, the switchdetachably securedto the cover plate 6 and disposed in ing element has to be dismantledalmost entirely when a 31 parallel relation therewith. The movableswitching concurrent transformer of difierent capacity or of dilferenttact 9 is in permanent sliding contact with a connecting class has to beprovided. In addition, it is not well possible contact 22 provided witha connecting block 23, which with said apparatus to provide a currenttransformer projects from the tubular member 7 into the tubular memwhoseprimary winding comprises more than one turn. ber 12 through a suitableopening thereof. Secured to The invention has for its object to avoidsaid disadvan- 49 said block 23 as by a bolt 24 is a conducting strip25, tages of the known constructions. It consists herein that which isalso connected to the second connecting contact the, or each, compositeswitching element is composed of 15 and is passed in a plurality ofturns through the transtwo sections electrically interconnected byreadily sepverse tubes 13, 14, so as to also constitute a multiturnarable members, the first section comprising the switching primarywinding of the current transformer. The magcontacts and one connectingcontact, the second section netic core 17 and the secondary transformerwinding 18 comprising the current transformer and the second conaredisposed around the transverse tube 13. necting contact, said secondsection being secured to the Each tubular member 11, 12 is provided withan axial cover so as to be bodily removable therefrom. With this slot26, 27, respectively. These slots enable the proper construction, thesecond section can be readily replaced positioning of the primarywinding 16 of the current by a similar section comprising a difierentcurrent trans- KO transformer after the tubular members 11', 12 and theformer, without it being necessary for the switch proper transversetubes 13, 14 have been assembled and secured to be dismantled. to theplate 19. After the primary winding 16 has been referably, the secondsection of the switching element, so positioned, the slots 26, 27 areclosed by slotted, insui. e. the section which comprises the currenttransformer lating partial sleeves 28 and 29, respectively, slidably andthe second connecting contact, will be composed of mounted on thetubular members 11 and 12, respectively. a plate member detachablyconnected to the cover and The cooperation of the connecting contacts10, 15 with disposed in parallel relation therewith, two insulating theterminals 2, 3 is such that, after removal of the cover tubular membersconnected to said plate member, one of 6, the entire composite switchinglenient can be lifted out these tubular members accommodating theconnecting of the casing 1, whilst the terminals 2, 3 remain alive.contact and the other accommodating the member for Should it now bedesired for another current transformer, electrically interconnectingboth sections of the switching having a different capacity or being ofanother class, to element, at least one transverse, insulating tubeinterconbe fitted, all that is necessary is: removing the entire nectingsaid tubular members, through which tube passes switching element fromthe casing 1, unscrewing the bolts the conductor interconnecting theconnecting contact and 20 and 24, whereby that section of said elementwhich the said connecting member, and at least one annular r comprisesthe current transformer is bodily disconnected magnetic core surroundingthe said transverse tube and from the cover and from the other sectionof the switching enclosed by the secondary winding of the transformer.element, and securing a similar section comprising another If the secondSection comprises at least two transverse current transformer both tothe cover 6 and to the block tubes, the conductor interconnecting theconnecting con- 23, whereupon the switching element can again be intactand the connecting member may be passed through serted into the casing.

What I claim is: 1. An electric circuit breaker for high tension,comprising a stationary metal casing adapted to be filled with aninsulating fluid, a cover detachably mounted on said casing, leading-inconductors insulatedly passing through the walls of the casing, aswitching element composed, of two individual sections suspended fromand independently attached to said cover and located in said casing, afirst one of said sections including a current transformer, readilyseparable members, one of which is mounted on one of the sections,electrically interconnecting the two sections of the switching element,means for attaching the first section to the cover for ready removaltherefrom after it has been removed from the casing, and a pair ofcooperating plug and bushing contacts between the leading-in conductorsand the respective sections of the switching element, said plug andbushing contacts permitting the cover together with the two sections ofthe switching element to be bodily removed from the casing anddisconnected from the conductors while the leading-in conductors areenergized.

2. An electric circuit-breaker in accordance with claim 1, in whichthere are cooperating switching contacts on one of the sections, one ofsaid switching contacts being directly electrically connected to one ofthe readily separable members which is mounted on said one section andthe other of said switching contacts being a part of the member of theplug and bushing contact which is mounted on said one section.

3. An electric circuit-breaker in accordance with claim 2; in which thefirst section of the switching element comprises a plate memberdetachably secured to the cover and disposed in parallel relationtherewith, two insulating tubular members secured to said plate, one ofsaid tubular members housing and supporting one of said contacts of oneof the pairs of plug and bushing contacts and the other supporting oneof the said readily separable conductive members for electricallyinterconnecting both sections of the switching element, at least oneinsulating transverse tube interconnecting the two tubular members, afurther conductor interconnecting said contact and said conductivemember and passing through said transverse tube, at

least one annular magnetic core surrounding said transverse tube and asecondary winding enclosing said core, said interconnecting conductor,said core, and said winding constituting together the said currenttransformer.

4. An electric circuit-breaker in accordance with claim 2, in which thefirst section of the switching element comprises a plate memberdetachably secured to the cover and disposed in parallel relationtherewith, two insulating tubular members secured to said plate, one ofsaid tubular members housing and supporting one of said contacts of oneof the pairs of plug and bushing contacts and the other supporting oneof the said readily separable conductive members for electricallyinterconnecting both sections of the switching element, at least twoinsulating transverse tubes interconnecting said contact and saidconductive member and passing at least twice through one transverse tubeand at least once through the other transverse tube, at least oneannular magnetic core surrounding the first mentioned transverse tubeand a secondary winding enclosing said core, said interconnectingconductor, said core, and said winding constituting together the saidcurrent transformer.

5. An electric circuit-breaker in accordance with claim 2, in which thefirst section of the switching element comprises a plate memberdetachably secured to the cover and disposed in parallel relationtherewith, two insulating tubular members secured to said plate, one ofsaid tubular members housing and supporting one of said contacts of oneof the pairs of plug and bushing contacts and the other supporting oneof the said readily separable conductive members for electricallyinterconnecting both sections or" the switching element, at least twoinsulating transverse tubes interconnecting the two tubular members,said transverse tubes extending into fitting apertures of the tubularmembers, a further conductor interconnecting said contact and saidconductive member and passing at least twice through one transverse tubeand at least once through the other transverse tube, slots beingprovided in said tubular members opposite said apertures and permittingsaid interconnecting conductor to be properly positioned after theinsulating tubular members and transverse tubes have been assembled to aunit, at least one annular magnetic core surrounding the first mentionedtransverse tube and a secondary winding enclosing said core, saidinterconnecting conductor, said core, and said winding constitutingtogether the said current transformer.

6. An electric circuit breaker in accordance with claim 2, having aninsulating tubular member housing the cooperating switching contacts andone of the contact of one of the pairs of plug and bushing contacts andsupporting one of the said readily separable conductive members forelectrically interconnecting both sections of the switching element, aplate member detachably secured to the cover and disposed in parailelrelation therewith, two insulating tubular members secured to saidplate, one of said tubular members housing and supporting one of saidcontacts of one of the pairs of plug and bushing contacts and the othersupporting the other one of the said readily separable conductivemembers, at least one insulating transverse tube interconnecting thelatter two tubular members, a further conductor interconnecting saidlatter contact and said other conductive member and passing through saidtransverse tube, at least one annular magnetic core surrounding saidtransverse tube and a secondary winding enclosing said core, saidinterconnecting conductor, said core and said winding constitutingtogether the said current transformer, and all three tubular membershaving their axes lying parallel to each other and contained in the sameplane perpendicula to said cover and said plate. 1

References Cited in the file of this patent UNITED STATES PATENTS

